-- @testpoint: opengauss关键字direct(非保留)，作为函数名，部分测试点合理报错

--关键字不带引号-成功
drop function if exists direct;
create function direct(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function if exists direct;
--关键字带双引号-成功
drop function if exists "direct";
create function "direct"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function if exists "direct";
--关键字带单引号-合理报错
drop function if exists 'direct';
create function 'direct'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `direct`;
create function `direct`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/